aspclassic-core/AspClassic.Scripting/SourceLocation.cs

using System;
using System.Globalization;

namespace AspClassic.Scripting;

[Serializable]
public struct SourceLocation
{
	private readonly int _index;

	private readonly int _line;

	private readonly int _column;

	public static readonly SourceLocation None = new SourceLocation(0, 16707566, 0, noChecks: true);

	public static readonly SourceLocation Invalid = new SourceLocation(0, 0, 0, noChecks: true);

	public static readonly SourceLocation MinValue = new SourceLocation(0, 1, 1);

	public int Index => _index;

	public int Line => _line;

	public int Column => _column;

	public bool IsValid
	{
		get
		{
			if (_line != 0)
			{
				return _column != 0;
			}
			return false;
		}
	}

	public SourceLocation(int index, int line, int column)
	{
		ValidateLocation(index, line, column);
		_index = index;
		_line = line;
		_column = column;
	}

	private static void ValidateLocation(int index, int line, int column)
	{
		if (index < 0)
		{
			throw ErrorOutOfRange("index", 0);
		}
		if (line < 1)
		{
			throw ErrorOutOfRange("line", 1);
		}
		if (column < 1)
		{
			throw ErrorOutOfRange("column", 1);
		}
	}

	private static Exception ErrorOutOfRange(object p0, object p1)
	{
		return new ArgumentOutOfRangeException($"{p0} must be greater than or equal to {p1}");
	}

	private SourceLocation(int index, int line, int column, bool noChecks)
	{
		_index = index;
		_line = line;
		_column = column;
	}

	public static bool operator ==(SourceLocation left, SourceLocation right)
	{
		if (left._index == right._index && left._line == right._line)
		{
			return left._column == right._column;
		}
		return false;
	}

	public static bool operator !=(SourceLocation left, SourceLocation right)
	{
		if (left._index == right._index && left._line == right._line)
		{
			return left._column != right._column;
		}
		return true;
	}

	public static bool operator <(SourceLocation left, SourceLocation right)
	{
		return left._index < right._index;
	}

	public static bool operator >(SourceLocation left, SourceLocation right)
	{
		return left._index > right._index;
	}

	public static bool operator <=(SourceLocation left, SourceLocation right)
	{
		return left._index <= right._index;
	}

	public static bool operator >=(SourceLocation left, SourceLocation right)
	{
		return left._index >= right._index;
	}

	public static int Compare(SourceLocation left, SourceLocation right)
	{
		if (left < right)
		{
			return -1;
		}
		if (right > left)
		{
			return 1;
		}
		return 0;
	}

	public override bool Equals(object obj)
	{
		if (!(obj is SourceLocation sourceLocation))
		{
			return false;
		}
		if (sourceLocation._index == _index && sourceLocation._line == _line)
		{
			return sourceLocation._column == _column;
		}
		return false;
	}

	public override int GetHashCode()
	{
		return (_line << 16) ^ _column;
	}

	public override string ToString()
	{
		return "(" + _line + "," + _column + ")";
	}

	internal string ToDebugString()
	{
		return string.Format(CultureInfo.CurrentCulture, "({0},{1},{2})", new object[3] { _index, _line, _column });
	}
}